netdev - Re: [RFC] net: add TCP fraglist GRO support

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Message-ID: <ebe85dca-e0e9-4c55-a15d-20d340f66848@nbd.name>
Date: Tue, 23 Apr 2024 14:23:32 +0200
From: Felix Fietkau <nbd@....name>
To: Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 David Ahern <dsahern@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC] net: add TCP fraglist GRO support

On 23.04.24 14:11, Eric Dumazet wrote:
> On Tue, Apr 23, 2024 at 1:55 PM Felix Fietkau <nbd@....name> wrote:
>>
>> In the world of consumer-grade WiFi devices, there are a lot of chipsets
>> with limited or nonexistent SG support, and very limited checksum
>> offload capabilities on Ethernet. The WiFi side of these devices is
>> often even worse. I think fraglist GRO is a decent fallback for the
>> inevitable corner cases.
> 
> What about netfilter and NAT ? Are they okay with NETIF_F_FRAGLIST_GRO already ?
> 
> Many of these devices are probably using NAT.

In my tests, nftables NAT works just fine, both with and without 
flowtable offloading. I didn't see anything in netfilter that would have 
a problem with this.

- Felix